SYSTEMS AND METHODS FOR SYNCHRONIZING DATA RECEIVED FROM MULTIPLE SENSOR MODULES IN A PATIENT MONITOR SYSTEM

• US 20120004516A1
• Filed: 07/01/2010
• Published: 01/05/2012
• Est. Priority Date: 07/01/2010
• Status: Active Grant

• Current Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (Excelsior Union Ltd.)
• Original Assignee: Mindray DS USA Incorporated (Excelsior Union Ltd.)
• Inventors: Menzel, Frank, Eng, William, Zahner, Daniel A.
• Granted Patent: US 9,149,188 B2
• Time in Patent Office: Days
• US Class Current: 600/301
• CPC Class Codes: A61B 5/0015 characterised by features of the telemetry system
• CPC Class Codes: A61B 5/0024 for multiple sensor units attached to the patient, e.g. using a body or personal area network
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: G16H 40/40 for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades

Abstract

A patient monitor system synchronizes patient data acquired by a plurality of sensor modules. Patient data from the sensor modules are synchronized by transmitting, from a patient monitor host, a start message that each newly connected sensor module uses to determine when to begin transmitting patient data to the patient monitor host. At a predetermined count interval, the patient monitor host also broadcasts an incrementing sequence count value to each of the connected sensor modules. The sensor modules use the sequence count values and the start message to determine when the patient monitor host expects each sensor module to transmit data packets. Each data packet sent by the sensor modules includes a sequence count value that the patient monitor host uses to align the various waveforms for display.

Claims

1. A patient monitor system for synchronizing the display of patient data, the system comprising:

a patient monitor host for receiving patient data sensed by a plurality of sensors attached to a patient, at least a first portion of the patient data arriving at the patient monitor host later than a second portion of the patient data, wherein the plurality of sensors sense the first and second portions of the patient data substantially simultaneously, the patient monitor host configured to;

transmit incrementing sequence count values at a predetermined count interval;

receive data packets including the patient data and data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted;

align the first portion of the patient data with the second portion of the patient data based on the respective data count values; and

display the aligned patient data on a display device; and

a plurality of sensor modules configured to selectively establish communications with the patient monitor host, the plurality of sensor modules respectively coupled to the plurality of sensors for acquiring the sensor data and for communicating the data packets to the patient monitor host, each of the plurality of sensor modules configured to start transmitting the data packets at predetermined transmission intervals based on a start value received from the patient monitor host.

2. The system of claim 1, wherein the patient monitor host comprises a sensor module interface configured to:

detect a new connection of one of the plurality of sensor modules;

in response to detecting the new connection, determine an updated start value based on a predetermined start interval and a maximum count value; and

transmit a start message to the newly connected sensor module with the updated start value.

3. The system of claim 2, wherein the sensor module interface comprises a counter for determining the incrementing sequence count values, wherein the maximum count value is based on a number of bits used by the counter, and wherein the counter rolls over to zero and continues counting after reaching the maximum count value.

4. The system of claim 2, wherein the patient data comprises waveform data and numeric parameter data, and wherein the predetermined start interval is equal to a predetermined parameter data interval at which the plurality of sensor modules transmit the numeric parameter data to the patient monitor host.

5. The system of claim 4, wherein the plurality of sensor modules are configured to transmit the waveform data to the patient monitor host at a predetermined waveform data interval that is less than the predetermined parameter data interval.

6. The system of claim 2, wherein the sensor module interface comprises a universal serial bus (USB) controller, and wherein the incrementing sequence count values comprise USB frame counts.

7. The system of claim 1, wherein the aligned patient data comprises waveform data.

8. The system of claim 7, wherein the patient monitor host updates the display of the aligned patient data based on a predetermined waveform data interval, and wherein the data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted are based on the predetermined waveform data interval.

9. The system of claim 7, wherein the patient monitor host is further configured to:

extract numeric parameter data from a subset of the received data packets; and

update, at a predetermined parameter data interval, a display of the numeric parameter data on the display device, wherein a subset of the data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted are based on the predetermined parameter data interval.

10. The system of claim 1, wherein each of the plurality of sensor modules is further configured to:

upon establishing communication with the patient monitor host, receive a start message from the patient monitor host with an updated start value;

collect initial waveform data from one or more of the sensors for a predetermined waveform data interval; and

calculate initial numeric parameter data associated with the initial waveform data.

11. The system of claim 10, wherein at least one of the plurality of sensor modules comprises a patient monitor interface configured to:

determine whether the received updated start value has expired based on the incrementing sequence count values transmitted by the patient monitor host; and

based on the determination of whether the received updated start value has expired, transmit an initial data packet including the initial waveform data and the initial numeric parameter data to the patient monitor host at a next start value.

12. The system of claim 11, wherein the initial data packet includes the next start value for use by the patient monitor host in aligning the initial waveform data with waveform data provided by the other sensor modules.

13. The system of claim 11, wherein the patient monitor interface is further configured to:

based on a current sequence count value received from the patient monitor host, determine that the received updated start value has expired; and

based on the determination that the received updated start value has expired, determine the next start value based on the received updated start value, a predetermined start interval, and a maximum count value.

14. The system of claim 11, wherein the patient monitor interface is further configured to:

based on a current sequence count value received from the patient monitor host, determine that the received updated start value has not expired; and

based on the determination that the received updated start value has not expired, set the next start value equal to the received updated start value.

15. The system of claim 11, wherein the patient monitor interface is further configured to:

based on the waveform data interval, periodically transmit subsequent data packets to the patient monitor host comprising subsequently collected waveform data and a data count value corresponding to the transmitted sequence count values at which the patient monitor host expects the patient monitor interface to transmit a next set of waveform data.

16. The system of claim 11, wherein the patient monitor interface is further configured to:

determine that a predetermined parameter data interval has lapsed;

based on the determination that the predetermined parameter data interval has lapsed, add subsequent numeric parameter data to a subsequent data packet with subsequent waveform data; and

transmit the subsequent data packet to the patient monitor host.

17. The system of claim 11, wherein the patient monitor interface comprises a universal serial bus (USB) device, and wherein the incrementing sequence count values comprise USB frame counts.

18. A method for synchronizing the display of patient data in a patient monitoring system, the method comprising:

acquiring, using a plurality of sensor modules, patient data sensed by a plurality of sensors;

receiving the patient data from the plurality of sensor modules at a patient monitor host, at least a first portion of the patient data arriving at the patient monitor host later than a second portion of the patient data, wherein the plurality of sensors sense the first and second portions of the patient data substantially simultaneously;

transmitting incrementing sequence count values from the patient monitor host at a predetermined count interval;

receiving, at the patient monitor host, data packets from the plurality of sensor modules, each of the plurality of sensor modules configured to start transmitting the data packets at predetermined transmission intervals based on a start value received from the patient monitor host, the data packets including the patient data and data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted;

aligning the first portion of the patient data with the second portion of the patient data based on the respective data count values; and

displaying the aligned patient data on a display device.

19. The method of claim 18, further comprising:

detecting, at the patient monitor host, a new connection of one of the plurality of sensor modules;

in response to detecting the new connection, determining an updated start value based on a predetermined start interval and a maximum count value; and

transmitting a start message to the newly connected sensor module with the updated start value.

20. The method of claim 19, wherein the patient data comprises waveform data and numeric parameter data, and wherein the predetermined start interval is equal to a predetermined parameter data interval at which the plurality of sensor modules transmit the numeric parameter data to the patient monitor host.

21. The method of claim 20, further comprising:

transmitting, from the plurality of sensor modules, the waveform data to the patient monitor host at a predetermined waveform data interval that is less than the predetermined parameter data interval.

22. The method of claim 18, wherein the aligned patient data comprises waveform data.

23. The method of claim 22, further comprising:

updating the display of the aligned patient data based on a predetermined waveform data interval, wherein the data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted are based on the predetermined waveform data interval.

24. The method of claim 22, further comprising:

extracting, at the patient monitor host, numeric parameter data from a subset of the received data packets; and

updating a display of the numeric parameter data on the display device, wherein a subset of the data count values corresponding to the transmitted sequence count values at which the patient monitor host expects the respective data packets to be transmitted are based on the predetermined parameter data interval.

25. The method of claim 18, further comprising:

upon establishing communication between a newly connected sensor module and the patient monitor host, receiving a start message at the newly connected sensor module from the patient monitor host with an updated start value;

collecting, at the newly connected sensor module, initial waveform data from one or more of the sensors for a predetermined waveform data interval;

calculating initial numeric parameter data associated with the initial waveform data;

determining whether the received updated start value has expired based on the incrementing sequence count values transmitted by the patient monitor host; and

based on the determination of whether the received updated start value has expired, transmitting an initial data packet including the initial waveform data and the initial numeric parameter data from the newly connected sensor module to the patient monitor host at a next start value.

26. The method of claim 25, wherein the initial data packet includes the next start value for use by the patient monitor host in aligning the initial waveform data with waveform data provided by the other sensor modules.

27. The method of claim 25, further comprising:

based on a current sequence count value received at the newly connected sensor module from the patient monitor host, determining that the received updated start value has expired; and

based on the determination that the received updated start value has expired, determining the next start value based on the received updated start value, a predetermined start interval, and a maximum count value.

28. The method of claim 25, further comprising:

based on a current sequence count value received at the newly connected sensor module from the patient monitor host, determining that the received updated start value has not expired; and

based on the determination that the received updated start value has not expired, setting the next start value equal to the received updated start value.

29. The method of claim 25, further comprising:

based on the waveform data interval, periodically transmitting subsequent data packets from the newly connected sensor module to the patient monitor host comprising subsequently collected waveform data and a data count value corresponding to the transmitted sequence count values at which the patient monitor host expects the patient monitor interface to transmit a next set of waveform data.

30. The method of claim 25, further comprising:

determining that a predetermined parameter data interval has lapsed;

based on the determination that the predetermined parameter data interval has lapsed, adding subsequent numeric parameter data to a subsequent data packet with subsequent waveform data; and

transmitting the subsequent data packet from the newly connected sensor module to the patient monitor host.

31. A system for synchronizing the display of patient data in a patient monitoring system, the system comprising:

means for acquiring patient data sensed by a plurality of sensors;

means for receiving the patient data from the means for acquiring;

means for transmitting incrementing sequence count values to the means for acquiring at a predetermined count interval;

the means for receiving further configured for receiving data packets from the means for acquiring, the means for acquiring configured to start transmitting the data packets at predetermined transmission intervals based on a start value received from the means for receiving, the data packets including the patient data and data count values corresponding to the transmitted sequence count values at which the means for receiving expects the respective data packets to be transmitted;

means for aligning the received patient data based on the respective data count values; and

means for displaying the aligned patient data.